The invention discloses an algae cultivating floating frame to overcome the defects of an existing algae cultivating device that multiple kinds of algae which grow at different depths can not be cultivated in the same sea area, the survival rate of young algae is low, and the collection rate of mature bodies is low. The algae cultivating floating frame comprises a floater, a hanging rope, multiple cultivation bodies and a positioning anchor, wherein the cultivation bodies are connected under the floater in series. Each cultivation body comprises a growing base body and a base body support, wherein the base body support comprises arc-shaped spokes, a base plate, a middle pillar and tightening ropes, the arc-shaped spokes are arranged on the base plate in a radial mode, one end of each arc-shaped spoke is connected with the edge of the base plate in a rotary mode, the other end of each arc-shaped spoke is bent towards the middle pillar, a pull ring is arranged at the tail end of each arc-shaped spoke, one end of each tightening rope is connected with the corresponding pull ring, and the algae bricks are arranged along the arc-shaped spokes. The algae cultivating floating frame has the advantages that multiple kinds of algae which grow at different depths can be cultivated at the same time; young algae are protected, and therefore the survival rate of young algae is increased; algae sink automatically when heavy waves come, and losses caused by damage to the algae are reduced.